keyboard bug

i have a laptop that has some form of keyboard virus or bug, when you type it registers a stuck key and keeps typing but not that letter that you pressed, for example if you press 'e' it wil continually type 's' until backspace is pressed, yet it works perfectly well on an external keyboard, has anybody got any advice?

i found some here too but i can't seem to find any instructions to remove it manually, and i dont have macafee antivirus and havin had past experiance with macafee software i no longer trust the software, there must be some other way of solving this problem

So do you mean you never had McAfee on the lap top, or it is no longer on it? Just trying to clarify for myself. It still could be a "mechanical" non-software related issue with the keyboard even though there is nothing wrong visually with it. The soldered tracks between the touch pads that the keys strike when pressed can go bad without much visual evidence causing all kinds of problems. If it is software related then a fresh install of the OS should fix it.